NAME¶

std::plus - std::plus

Synopsis¶

Defined in header <functional>
template< class T > (until C++14)
struct plus;
template< class T = void > (since C++14)
struct plus;

Function object for performing addition. Effectively calls operator+ on two
instances of type T.

Specializations¶

The standard library provides a specialization of std::plus when T is
not specified, which leaves the parameter types and return type to be
deduced.
(since C++14)
plus<void> function object implementing x + y deducing parameter and
(C++14) return types
(class template specialization)

Member types¶

Type Definition
result_type (deprecated in C++17)(removed in C++20) T
first_argument_type (deprecated in C++17)(removed in C++20) T
second_argument_type (deprecated in C++17)(removed in C++20) T

These member types are obtained via publicly inheriting (until C++11)
std::binary_function<T, T, T>.

Member functions¶

operator() returns the sum of two arguments
(public member function)

std::plus::operator()

T operator()( const T& lhs, const T& rhs ) const; (until C++14)
constexpr T operator()( const T& lhs, const T& rhs ) const; (since C++14)

Returns the sum of lhs and rhs.

Parameters¶

lhs, rhs - values to sum

Return value¶

The result of lhs + rhs.

Exceptions¶

May throw implementation-defined exceptions.

Possible implementation¶

constexpr T operator()(const T& lhs, const T& rhs) const
{
return lhs + rhs;
}